Papers by Keyword: Recycling

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Authors: Ji Li Zha, Shao Yong Xu, Guo Qiang You, Si Yuan Long
Abstract: In the present paper, the current state of magnesium scrap recycling via melt refinement was reviewed and the difficulties confronted in the developing fluxless techniques were highlighted. Then, the working principle of a fluxless technique newly developed in China was briefly introduced followed by chemical and light microscopy investigation of the processing quality of the recycled ingots in comparison with the commercial ingot produced with predominant flux processing to have a first insight into the difference of the two refining techniques. The results indicate that a stable, continuous and cost effective melt refinement can be achieved with the commercial Mg scraps in-house fluxless recycling system.
Authors: Hong Long Xu, Zi Qiang Zhou, Zhao Ren Wu
Abstract: Recycling of End of Life Vehicle (ELV) is a coming social issue in China. For the purpose of establishing recycling enterprise rationally, all the aspect should be taken into account, especially the cost of recycling. In this paper a cost model of recycling process is presented and analyzed to the disassembly and recycling process. The configuration of equipment with different mode of disassembly is also discussed.
Authors: Jonas Huether, Robert Maertens, Oleg Saburow, Elisa Seiler, Theresa Aicher, Kay André Weidenmann
Abstract: The increasing demand for composites leads to a growing amount of end-of-life materialand production waste. The latter consists of a large fraction of unimpregnated fibre waste which is notsufficiently reprocessed using conventional textile processing procedures as they are either too expensiveor their mechanical performance is too low. Using pieces of dry non-crimp fabrics (patches) ina Bulk Moulding Compound process (BMC) displays a straightforward approach of fabric recycling.Adding fillers to the mixture not only offers the opportunity to modify mechanical and electrical propertiesas well as the costs but also a chance for a more holistic approach of dry fibre recycling, whenconventional fillers like chalk are replaced by ground recycled carbon fibres. In this way, all kindof dry fibre wastes can be reused in one process: Larger offcuts are chopped to smaller rectangularpatches whereas waste fractions of small offcuts are processed to carbon fibre powder as filler andprocessed together with resin to produce BMC materials. Mechanical investigations reveal that thepresented approach shows higher specific properties than the conventional filler without compromisingthe process and material quality.
Authors: Muhammad Raisul Abedin, Shamsul Abedin, Md. Hasib Al Mahbub, Nandini Deb, Mohidus Samad Khan
Abstract: This study addresses the recovery of recovery of zinc (Zn) and manganese (Mn) from spent dry cell (Zn-C battery) batteries using a hydrometallurgical approach. Every year, a significant number of Zn-C dry cell batteries are consumed and disposed worldwide. Zn-C dry cell batteries constitute more than 60% of Zn and Mn together. Higher amount of Zn and Mn present in Zn-C dry cells shows an industrial interest in recycling and recovering Zn and Mn. In this study the recovery of Zn and Mn from spent dry cells was investigated through an energy efficient hydrometallurgical route. Zn-C batteries were manually dismantled to collect the battery paste. Neutral leaching was carried out to remove potassium and non-metal contents. The battery powder was leached in sulfuric acid medium with glucose as reducing agent. The experiments were conducted according to ‘24 full factorial design’. The purpose of the design was to identify the most effective and optimum condition for Zn and Mn recovery from spent Zn-C batteries. Using the optimum operating condition, up to 86.54 % of Mn and 82.19% of Zn were recovered from the original battery powder.
Authors: Jarosław Molenda
Abstract: Antifreeze glycol-based fluids are widely used in various types of industrial systems, equipped with indirect heat exchange systems. A very broad area of the application of glycol fluids is possible due to their primary physicochemical properties, i.e. relatively high boiling point, very low freezing point, and negligible thermal expansion [1,2]. Examples of the application of these fluids may be, e.g. cooling systems and air conditioning, in which glycol fluid is the heat transferring agent [3 – 5].
Authors: Lei Shi, De Sheng Zhu
Abstract: The method of recycling waste solution of copper plating using cyanidation in laboratory involves the comprehensive utilization of waste solution in the electroplating field. The method includes the following steps: first, add activated carbon into the waste to remove the organic impurities, lower the temperature of the waste with cooling fin and form sediments to remove carbonate salt in it. Add sodium sulfide, alizarin into the waste, and the containing heavy metal element Pb2+, Zn2+ and Cr3+ in it precipitate through chemical reactions. Place the waste solution in the closed container and make cyanide hydrolyze to produce non-toxic sodium formate and ammonia by adding alkali and under heat and pressure conditions. It provides an easy and convenient method, which can effectively recover resources, and reduce pollution for recycling copper cyanide waste solution in laboratory.
Authors: Won Ha, Shae K. Kim, Hyung Ho Jo, Myoung Gyun Kim, Young Jig Kim
Authors: Yasuo Kondo, M. Yamaguchi, Kenji Yamaguchi, S. Sakamoto
Abstract: We discussed the coolant composition which can guarantee both the excellent fluid abilities as the cutting fluid and the good treatability as the recyclable material toward the development of sustainable cutting fluid system. We prepared three distinctive coolants; amine-free (EX-102), mineral-oil and amine free (α-1000) and amine-containing (EM-L) coolants. All of the coolants have excellent emulsion stability for standing in the natural condition butα-1000 and EM-L showed a good anti-rust properties while EX-102 showed a rather poor anti-rust property for the cast iron chips. The vegetable oil has a rather poor stability in lubricating performance than that of the mineral oils and synthetic ester. The alkaline substances dissolved in the amine-free coolant can be separated by the surfactant treatment as well as the oil contents, while some alkaline substances, maybe di-ethanol amine, are still retained in the recovered water from the amine-containing coolant. The activated carbon treatment showed no significant change for all of the coolant. Amine-containing coolant forms no stable emulsion; the recovered water cant utilize as a diluents of newly water-soluble coolant while the amine-free coolants can form a stable emulsion to a certain extent. The most direct attack to make the cutting fluid sustainable would be developing a new emulsifier and corrosion inhibitor that can substitute for amine compounds and can show a good treatability like the amine-free cutting fluid.
Authors: Yan Mei Yang, Shi Qiang Wei
Abstract: Many kinds of construction wastes are now produced in China. Recycling disposal of construction wastes not only alleviate pressure on the environment but also identify certain economic and social benefits. This paper undertakes a timely review of recycling disposal of construction waste in China's Road Construction Industry. The paper presented definitions of construction wastes and described the current situation of construction wastes in China. Considering the research findings which have been achieved in the field of waste disposal, this paper discussed the approaches to recycle construction wastes in China including abandoned concrete, waste asphalt, old brick, waste timber, sewage sludge. The conclusion makes recommendations that are deemed to offer substantial benefits for both the road construction industry and society as a whole.
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